[moderation] [virtualization?] KCSAN: data-race in virtqueue_enable_cb_delayed / vring_interrupt (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 610a9b8f49fb Linux 6.7-rc8
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13b07d81e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=17e138c8fc533c5e
dashboard link: https://syzkaller.appspot.com/bug?extid=8e2f6c3a0fd4d0d4778d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
CC: [jaso...@redhat.com linux-...@vger.kernel.org m...@redhat.com virtual...@lists.linux.dev xuan...@linux.alibaba.com]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/238dea1fdecf/disk-610a9b8f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c4adb81883c3/vmlinux-610a9b8f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ad74642e2389/bzImage-610a9b8f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8e2f6c...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in virtqueue_enable_cb_delayed / vring_interrupt

write to 0xffff8881029d5052 of 1 bytes by interrupt on cpu 0:
vring_interrupt+0x128/0x170 drivers/virtio/virtio_ring.c:2591
__handle_irq_event_percpu+0x91/0x490 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0x64/0xf0 kernel/irq/handle.c:210
handle_edge_irq+0x167/0x590 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x54/0xe0 arch/x86/kernel/irq.c:257
common_interrupt+0x3d/0x90 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:640

read to 0xffff8881029d5052 of 1 bytes by task 3067 on cpu 1:
virtqueue_enable_cb_delayed+0x23/0x3b0 drivers/virtio/virtio_ring.c:2532
start_xmit+0x115/0xa90 drivers/net/virtio_net.c:2345
__netdev_start_xmit include/linux/netdevice.h:4940 [inline]
netdev_start_xmit include/linux/netdevice.h:4954 [inline]
xmit_one net/core/dev.c:3548 [inline]
dev_hard_start_xmit+0x11b/0x3f0 net/core/dev.c:3564
sch_direct_xmit+0x1b0/0x570 net/sched/sch_generic.c:342
__dev_xmit_skb net/core/dev.c:3775 [inline]
__dev_queue_xmit+0xe59/0x1d80 net/core/dev.c:4315
dev_queue_xmit include/linux/netdevice.h:3134 [inline]
neigh_hh_output include/net/neighbour.h:526 [inline]
neigh_output include/net/neighbour.h:540 [inline]
ip_finish_output2+0x732/0x880 net/ipv4/ip_output.c:235
ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:323
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip_output+0xab/0x170 net/ipv4/ip_output.c:433
dst_output include/net/dst.h:451 [inline]
ip_local_out net/ipv4/ip_output.c:129 [inline]
__ip_queue_xmit+0xb09/0xb30 net/ipv4/ip_output.c:535
ip_queue_xmit+0x38/0x40 net/ipv4/ip_output.c:549
__tcp_transmit_skb+0x11d9/0x1890 net/ipv4/tcp_output.c:1462
tcp_transmit_skb net/ipv4/tcp_output.c:1480 [inline]
tcp_write_xmit+0x12d7/0x2fd0 net/ipv4/tcp_output.c:2792
__tcp_push_pending_frames+0x6a/0x1a0 net/ipv4/tcp_output.c:2977
tcp_push+0x320/0x330 net/ipv4/tcp.c:736
tcp_sendmsg_locked+0x21b6/0x2690 net/ipv4/tcp.c:1308
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1340
inet_sendmsg+0x63/0x80 net/ipv4/af_inet.c:847
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
sock_write_iter+0x1aa/0x230 net/socket.c:1158
call_write_iter include/linux/fs.h:2020 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x48a/0x790 fs/read_write.c:584
ksys_write+0xeb/0x1a0 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__x64_sys_write+0x42/0x50 fs/read_write.c:646
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3067 Comm: sshd Not tainted 6.7.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.